To summarize, these are all the features that have already been requested.
- Moddable GM mode
- GM playing monsters
- Player dedicated servers
- GMind the main game
- Add/Remove enemies, traps and such
- Permadeath/new character option
- Multiple GMs
- Dedicated server for persistent modules
- Connection to a database
- Chat channels
- Needs to be 100% stable
- On the fly conversations
- Release "when it's done" over delaying the game with it
- Queue events together or with a timer
- Player become GM and vice-versa
- Procedural generation
- Sessions replay
- Preplan and save an area
- Random Encounter chart for the GM
- Adding personal quest linked to the main campaign
- Hiding player stats from the GM
- A dialogue tool for GM
I am happy with all of those but I find that the list is quite geared toward using OSII as a new iteration of NWN or NWN2 (i.e. a video game) persistent worlds.